comphead commented on issue #9144:
URL:
https://github.com/apache/arrow-datafusion/issues/9144#issuecomment-2000495468
Update: reading from table or parquet doesn't cause exponential schema calls
growth.
Queries with literals causes that like
```
let sql = "select a, a + 1, a+2 b from (select 1 a union all select 2 a
union all select 3 a union all select 4 a union all select 5 a union all select
6 a)";
```
But this is rare and won't be that critical.
However for reading parquet and tables another problem arises with wild card
expansion
adding outer `select *` adds 50 new calls to `with_new_metadata`
```
let sql = "select * from (select * from (select * from (select * from
(select * from (select a, a+1, a+2, a+3, a+4, a+5, a+6, a+7, a+8, a+9 from
t1)))))";
```
makes 359 calls
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